You don't need to relog, you just simply need to get out of range of the container and walk back to it 👍

Is this sourced from a community server? I don't believe the cauldron spawns in the vanilla CLE (unless during an event).
If so, the configuration files in the community server may differ from that of an official server which may be causing this issue.

Had a chance to look over your thread, this is what I've put together so far - https://feedback.bistudio.com/T165558

Thanks for submitting this - been experiencing similar issues on console as well (however we also can't access Altar Radio through vicinity either).